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2 Sheets-Sheet 1 0 W. STOW & H. s. GR'ANNIS. Tinsmiths Shearing Device.

No. 230,905. Patented Aug. 10,1880.-

Mu A4010 al W V v 2Sheets-Shpet 2. STOW & H. s. GRANNIS.

T'ifiismiths Shearing Device.

No. 230,905. Patented Aug. 10,1880.

UNITE STATES Fries.

ORSON W. STO\V AND HIAL S. GRANNIS, OF PLANTSVILLE, ASSIGNOBS TO THE PECK, STOW & l/VILOOX COMPANY, OF SOUTHINGTON, CONN.

TINSMITHS SHEARINGDEVICE.

SPECIFICATION forming part of Letters Patent No. 230,905, dated August 10, 1880.

Application filed February 18, 1880.

To all whom it may concern Be it known that we, ORSON V. STOW and HIAL S. GRANNIS, both of Plantsville, in the county of Hartford and State of Connecticut,

haveinvented certain new and useful Improvements in Gage Attachments for Tinsmiths Shears, of which the following is a specification.

Ourinvention relates toimprovementsin gage 1o attachments for tinsmiths shears, in which the ends of the gage are supported upon hori zontal screw-threaded rods by means of a sliding block in which is a screw-adjusted vertical yoke having notches which may be brought I5 into and out of engagement with the threaded rods; and the objects of our improvements are, first, a convenient means for effecting a delicate adjustment; and, second, a convenient means, in connection therewith, for quickly effecting an approximate adjustment.

WVe attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a top or plan view of the entire machine. Fig. 2 is a side elevation of the same, and Fig. 3 is an enlarged vertical section of a detached part thereof on line aa: of Fig. 1.

The shears proper are the same as those in common use. Upon the back of the shears, preferably attached to the frame which carries the vertically-movin blade, we place two horizontal arms, A A, provided with lugs a a, within which we place an adjustingscrew, B, so mounted that it may be readily rotated without moving it endwise. Upon each of the screws B B there is a vertically-slotted block, I), the hole in said block through which the screw B passes being large enough to allow said block to be slipped alongover the threaded body of said screw.

In the vertical slot of each block b there is a yoke, c, surrounding the threaded body of the screws B B, and provided with a threaded shank, which extends upward through the block and is provided with a thumb-nut, d. The hole in the yoke 0 through which the threaded body of the screws B B passes is also large enough to allow the yoke to he slipped along over said screw, and the side of the hole which is under the screw is either threaded or provided with a series of projections which match the threads on said screw, as shown in the sectional view, Fig. 3.

The ends of the gage 0 rest upon the block b b, and the threaded shank of the yoke 0 passes through them.

The operation is as follows: The nuts d are loosened, so as to allow the yokes to drop sufficiently to disengage tliemfrom the threads of the screw. The block, together with the gage, may then be slipped along upon the screws B B, to adjust the respective ends of the gage into approximately the desired position. The thumb-nuts are then turned down to draw up the yokes and cause them to engage the threads of the screws upon their under side. The screws B B may then be turned to move the gage slightly for any fine or delicate adjustment that may be desired. The nuts may then be tightened to bind the blocks and gage immovably in place.

If desired, instead of making the adj ustingscrews also constitute the arms upon which the gage is slipped and supported, the ends of the gage might be mounted upon blocks provided with short horizontal adjustingscrews for a delicate adjustment, and such blocks, together with their adjusting-screws, slipped approximately into place and secured upon plain unthreaded arms, after which the adjusting-screws may be used.

in this modification, as well as in the firstdescribed mechanism, there are two mechanisms or means-one for effecting the rapid and approximate adjustment of the gage, and the otherin both cases consisting ofa horizontal adjusting-screw for effecting the delicate adjustment.

Squaring-shears, as heretofore made, have had the ends of their back gage adjusted upon a slotted arm and secured by a bolt passing through said slotted arm and gage, but without any mechanism whatever for effecting a delicate adjustment, which, when desired, 5 could only be accomplished by rapping the gage when it was only partially fastened in place.

W'e claim as our invent-ion l. The gage O of squaring-shears, in com.

bination with the horizontal arms for supportwith the block I), yoke 0, end of gage (J, and the 10 ing said gage, means for fastening the gage to nut (I, substantially as described, and for the said arms and loosening it therefrom to enapurpose specified. ble the ends of the gage to be slipped along, 5 and screw-adjusting mechanism for effecting the final and more delicate adjustment thereof, substantially as described, and for the pur- Witnesses: pose specified. E. A. WOOD,

2. The horizontal screw B, in combination G. R. BOND. 

